Packaging pulverulent materials



J. WANDER.

PACKAGING PULVERULENT MATERIALS.

APPLICATION FILED AUG.20| I919.

Patented June 29, 1920.

v UNITED, STATES PATENT o ncE.

JOSEPH WANDER, OF ALBANY, NEW YORK, ASSIGNOR TO S. WANDER & SONS CHEMICAL 00., INC., OF ALBANY, NEW YORK, A CORPORATION OF NEW YORK.

Application filed August 20,

To all whom it may concern:

Be it known that I, JosErH WANDER, a citizen of the United States of America, and resident of Albany, Albany county, and State of New York, have invented certain new and useful Improvements in and Relating-to Packaging Pulverulent Materials,

of which the following is a specification.

This invention relates to the art of packaging pulverulent chemicals and other powdered or finely divided materials; and the objects and nature of the invention will be readily understood by those skilled in the art in the light of the following explanations of the method followed in packaging pulverulent materials, and of the accompanying drawings illustrating what I now believe to be the preferred mechanical expression or embodiment of my invention from among other forms, constructions and arrangements within the spirit and scope thereof.

Various pulverulent materials, such chemicals, for instance, as chlorinated lime, etc., particularly for household use, are usually packed more or less loosely, in air tight containers or cans, of various sizes. The chemicals are placed in such cans and sealed at the factory and thus reach the household or consumer through various trade channels. These cans are usually sealed at the top by air tight plug closures that can be pried from the can tops to permit egress of the chemical contents.'

Under certain conditions, pressure will be generated in such sealed cans of chemicals. I t has been found that varying temperatures and weather conditions will sometimes cause the generation of gas in such cans, and that such pressure when suddenly released by the removal of the closure plug, will cause what might be termed, an explosion discharging loose or powdered chemical contents into the room and over the person opening the can with possibly resulting damage and injury. Whether or not such gas or pressure generationis the result oftemperature and weather conditions, or other causes, the fact remains, that the packers of such chemicals have-been confronted by a serious problem owing to such scattering of powdered chemicals when some cans are opened and the resulting damage.

It is the object of my invention to provide measures that will prevent such discharge PACKAGING PULVERULENT MATERIALS.

Specification of Letters Patent. Pa,tented J 11 119 29, 1920.

1919. Serial No. 318,788.

of the cans are under pressure, and to this end I provide means that will automatically prevent discharge of the powdered contents when the can is opened while permitting the more or less slow or gradual discharge of gas or pressure.

With these and other objects in view, my invention consists in a novel manner of packing such materials in cans and other containers, and-in certain novel features in arrangement, construction and combination, as more fully and particularly set forth and specified hereinafter.

Referring to the accompanying drawings:

Flgure 1 is a perspective view of a sealed package of pulverulent material such as chlorinated lime, the can being partially broken away to show the powdered contents, the top closure, and the disk valve or guard. ddiig. 2 is a detail perspective view of the is r.

In the drawings I show any suitable can (container) having impervious wall 1, permanent air tight usually metal bottom 2, and permanent usually metal top 3. The top 3 can be formed by a metal disk at its edge united to the top edge of the wall by a permanent air tight seam or crimp 4, or in any other suitable manner. In the particular example illustrated, this metal disk is formed, with a central opening surrounded by a depending annular edge or flange 5, and this opening is tightly sealed to form an air tight closure by a removable plug or cap 6 of a usual or any other suitable construction. This is a common form of closure wherein the plug is forced into place dimensions as to be more or less freelymovable vertically within the can between the loose mass of powdered material and the can top. The outside diameter of the disk is i the can and also permit upward leakage of gas or air along the inner surface of the can wall past the edge of the disk. The disk is also imperforate at least to such an extent as to prevent the powdered -material blowing therethrough.

The disk also is more or less flexible and composed of material that can be easily cut or severed to form an opening registering with the discharge opening in the can top for discharge of the powdered material after the can has been opened.

As at present advised, I prefer to form the disks of paper or paper. material.

When the plug or closure is pried from a can in which the generation of gas has produced pressure, the gas in seeking relief through the can discharge opening, will almost instantaneously force the disk 10 up wardly against the under side of the can top and thereby prevent discharge or blowing of powdered contents from the can, while permitting the gas to more or less slowly leak past the edge of the disk and between the top surface of the disk and the lower edge of flange 5 and find relief. The operator will then by a knife blade or any other suitable instrument inserted through the mouth or discharge opening of the can, cut out and remove the central portion 10 of the disk so that the powdered contents can be discharged through the opening in the disk and the can mouth. I

The top surface of the central portion of the disk preferably bears words or other indicia visible through the can mouth after the plug has been removed, and imparting information that the disk must be cut f through or removed to permit discharge of the powdered contents. For instance, I usually provide the top face of the disk with instructions such as Cut this .out,

although I do not wish to so limit my invention. I

In packing the powdered chemical material, in accordance with my invention, the

cans are filled with the powdered chemical before the tops 3 are applied to the can bodies. The guard or barrierdisks 10 are then placed in the cans resting on the powdered contents. After the cans have been thus loaded and the disks applied, the cans are tightly sealed by application of the can tops 3 and plugs 6.

I do not wish to limit my invention to the illustrated, the diameter of the disk exceeds the diameter of the can discharge mouth and hence the disk is prevented frombeing blown through the discharge mouth, as the paper material is of suflicientstiifness to prevent such deformation of the disk under the gas pressure as would permit passage of the disk through such month.

It is evident that various changes, modifications and variations might be resorted to without departing from the spirit and scope of my invention and hence I do not wish to limit myself to the exact disclosures hereof. What I claim is:

1. A sealed package of pulverulent material embodyinga container having its discharge mouth sealed by a closure, and a loose barrier disk within the container constructed and arranged to permit gas relief and prevent powdered contents being blown through said discharge mouth when the closure is broken. 4.

2. A sealed can containing loose powdered chemical material characterized by an internal barrier between the contents and the can mouth constructed and arranged to pre vent the powder being blown through said mouth by pressure within the can, when said mouth is opened.

3. An originalpackage of loose powdered chemical material embodying an air tight can having a discharge adapted to be opened for discharge of the can contents, said pack- .age having an internal barrier against paswithin the can between saidmouth and the powdered contents. I

Signed. JOSEPH WANDER. 

